Last time I chacked they were still available new from GM. I think Year One also has them. You will find however that they are different sizes, left & right. I didn't like this, so I found a set of 71-72 Cutlass mirrors on Ebay... Then I cut them up to make them power remote.
Then again, I am kinda sick.
Shiny Side Up!
Bill
'72 442 "Inamorata"